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Surface Treatment of Inorganic CsPbI_(3) nanocrystals with Guanidinium Iodide for Efficient Perovskite Light-Emitting Diodes with High Brightness

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Nano-Micro Letters 2022年第4期14卷 277-288页

作者： Minh Tam Hoang Amandeep Singh Pannu Yang Yang Sepideh Madani Paul Shaw Prashant Sonar Tuquabo Tesfamichael Hongxia Wang Faculty of Science School of Chemistry and PhysicsQueensland University of TechnologyBrisbaneQLD 4001Australia Centre for Materials Science Queensland University of TechnologyBrisbaneQLD 4001Australia School of Mechanical Medical and Process EngineeringFaculty of EngineeringQueensland University of TechnologyBrisbaneQLD 4001Australia Centre for Organic Photonics&Electronics(COPE) School of Chemistry and Molecular BiosciencesThe University of QueenslandBrisbaneQLD 4072Australia

The remarkable evolution of metal halide perovskites in the past decade makes them promise for next-generation optoelectronic material.In particular,nanocrystals(NCs)of inorganic perovskites have demonstrated excellent performance for light-emitting and display applications.However,the presence of surface defects on the NCs negatively impacts their performance in devices.Herein,we report a compatible facial post-treatment of CsPbI_(3) nanocrystals using guanidinium iodide(GuI).It is found that the GuI treatment effectively passivated the halide vacancy defects on the surface of the NCs while offering effective surface protection and exciton confinement thanks to the beneficial contribution of iodide and guanidinium cation.As a consequence,the film of treated CsPbI_(3) nanocrystals exhibited significantly enhanced luminescence and charge transport properties,leading to high-performance light-emitting diode with maximum external quantum efficiency of 13.8%with high brightness(peak luminance of 7039 cd m^(−2) and a peak current density of 10.8 cd A^(−1)).The EQE is over threefold higher than performance of untreated device(EQE:3.8%).The operational half-lifetime of the treated devices also was significantly improved with T50 of 20 min(at current density of 25 mA cm^(−2)),outperforming the untreated devices(T50~6 min).

关键词： CsPbI_(3)perovskites nanocrystals Light-emitting diodes Photoluminescence Surface passivation Guanidinium iodide

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nanocrystals for large Stokes shift-based optosensing

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Chinese Chemical Letters 2019年第10期30卷 1843-1848页

作者： Ronghui Zhou Xiaomei Lu Qin Yang Peng Wu State Key Laboratory of Oral Diseases West China Hospital of StomatologySichuan UniversityChengdu 610041China Analytical&Testing Center Sichuan UniversityChengdu 610064China College of Light Industry and Textile and Food Engineering Sichuan UniversityChengdu 610065China

Stokes shift is an important feature of fluorescence, which reveals the energy loss between the excitation and the emission. For most fluorescent materials(e.g., organic dyes and proteins), the large overlap between the absorption and emission spectra endow them a small Stokes shift that induced reabsorption by fluorophore itself. Although the self-absorption can be effectively reduced due to the emergence of fluorescent nanomaterials, fluorescence attenuation is still observed in aggregated or concentrated nanocrystals, causing reduced sensitivity of biosensors. Therefore, increasing the Stokes shift can effectively improve the performance of nano-agents based biosensing. In this critical review, through understanding the Stokes shift from the viewpoint of self-absorption, the influence of Stokes shift on fluorescence properties are discussed. Based on the principle of changing the Stokes shift of fluorescent nanomaterials, we described the methods for constructing various optically large Stokes shift-based nanomaterials, and the application of these nanocrystals in biosensing is especially concerned in this review.

关键词： Stokes shift Self-absorption Band gap Optical nanocrystals Biosensing

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高稳定性铋基钙钛矿纳米晶的可控合成:结构和光物理性质

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Science China Materials 2023年第5期66卷 2079-2089页

作者：耿慧芳黄转转耿华修刘思宇 Maria A Naumova Raffaele Salvia 陈司淇韦钧励张丽芙邹贤劭林伟华蔡欣怡袁明鉴胡振芃沈希于日成郑凯波 Sophie E.Canton 付学文 Ultrafast Electron Microscopy Laboratory Key Laboratory of Weak-Light Nonlinear Photonics(Ministry of Education)School of PhysicsNankai UniversityTianjin 300071China Institute of Molecular Plus Tianjin UniversityTianjin 300072China Deutsches Elektronen-Synchrotron DESY Notkestr.8522607 HamburgGermany Scuola Normale Superiore Piazza dei Cavalieri 7IT-56126 Pisa(PI)Italy Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Renewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin 300071China Chemical Physics and Nano Lund Lund UniversityBox 12422100 LundSweden Binhai College Nankai UniversityTianjin 300270China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Department of Chemistry Technical University of DenmarkDK-2800 Kongens LyngbyDenmark Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

铋基钙钛矿因毒性低成为铅基钙钛矿的潜在替代品.目前,对铋基钙钛矿纳米晶的化学组成、晶体结构以及光物理过程的研究还缺乏系统性.特别地,紫外-可见吸收光谱和激发态载流子动力学,在已发表的论文中存在相当大的争议.在本文中,我们通过... 详细信息

铋基钙钛矿因毒性低成为铅基钙钛矿的潜在替代品.目前,对铋基钙钛矿纳米晶的化学组成、晶体结构以及光物理过程的研究还缺乏系统性.特别地,紫外-可见吸收光谱和激发态载流子动力学,在已发表的论文中存在相当大的争议.在本文中,我们通过热注入法成功地合成了纯相的Cs_(3)BiBr_(6)和Cs_(3)Bi_(2)Br_(9)纳米晶,并通过调节热注入的温度来精确控制二者的化学组成和结构.在此基础上,系统研究了不同形貌和不同尺寸的Cs_(3)Bi_(2)Br_(9)纳米晶的紫外-可见吸收光谱,澄清了在这方面存在的争议.采用飞秒瞬态吸收光谱系统研究了Cs_(3)Bi_(2)Br_(9)纳米晶的激发态载流子动力学,结果表明载流子在被激发后的3 ps内会发生一个自捕获过程.与配体辅助再沉积法相比,用热注入法制备的Cs_(3)Bi_(2)Br_(9)纳米晶具有更好的光稳定性.基于Cs_(3)Bi_(2)Br_(9)纳米晶的光电探测器具有灵敏的光响应,显示出其在光电探测方面的应用潜力.

关键词： lead-free perovskites bismuth perovskites nanocrystals hot injection photostability

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Laser-induced inverted patterning of nanocrystals embedded glass for micro-light-emitting diodes

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Journal of Materials Science & Technology 2023年第19期150卷 138-144页

作者： Yuzhou Hu Ying Ye Wenchao Zhang Kai Li Yao Zhou Yudong Zhang Zhao Deng Jianjun Han Xiujian Zhao Chao Liu State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

High resolution and full-color light-emitting diodes require precise and efficient patterning of light-emitting structures containing quantum dots or nanocrystals.We report light-induced inverted patterning of nanocrystals in glasses for micro-light-emitting diodes.Ultrafast laser pulse induces structural destruction and amorphization of nanocrystals in glasses,forming inverted luminescent patterns.High-throughput patterning of micrometer-scale,thermally stable,and highly photoluminescent structures in nanocrystals embedded glass is realized.This patterning method provides a novel way to fabricate high-performance and ultrahigh-resolution color conversion layers for micrometer-scale light-emitting diodes.

关键词： nanocrystals Ultrafast laser Sub-micro patterning Micro-light-emitting-diodes

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Boosting self-trapped exciton emission from Cs_(3)Cu_(2)I_(5)nanocrystals by doping-enhanced exciton-phonon coupling

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Nano Research 2023年第7期16卷 10476-10482页

作者： Xiaohan Li Aijun Liu Zhaoyu Wang Youchao Wei Qun Lin Yameng Chen Yongsheng Liu Maochun Hong College of Chemistry Fuzhou UniversityFuzhou 350116China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

Self-trapped excitons(STEs)emission from halide perovskites with strong exciton-phonon coupling has attracted considerable attention due to the widespread application in optoelectronic devices.Nevertheless,the in-depth understanding of the relationship between exciton-phonon coupling and luminescence intensity remains incomplete.Herein,a doping-enhanced exciton-phonon coupling effect is observed in Cs_(3)Cu_(2)I_(5)nanocrystals(NCs),which leads to a remarkable increasement of their STEs emission efficiency.Mechanism study shows that the hetero-valent substitution of Cu+with alkaline-earth metal ions(AE^(2+))causes a greater degree of Jahn-Teller distortion between the ground state and excited state structures of[Cu_(2)I_(5)]_(3)-clusters as evidenced by our spectral analysis and first-principles calculations.As a consequence,an X-ray detector based on these Cs_(3)Cu_(2)I_(5):AE NCs delivers an X-ray imaging resolution of up to 10 lp·mm^(-1) and a low detection limit of 0.37μGyair·s^(-1),disclosing the potential of doping-enhanced exciton-phonon coupling effect in improving STEs-emission and practical application for X-ray imaging.

关键词： Cs_(3)Cu_(2)I_(5) nanocrystals self-trapped exciton exciton-phonon coupling X-ray image

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Ternary phase diagram of all-inorganic perovskite CsPbCl_(a)Br_(b)I_(3−a−b)nanocrystals

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Nano Research 2022年第8期15卷 7590-7596页

作者： Xin Lv Gaoyu Chen Xia Zhu Jiakun An Jianchun Bao Xiangxing Xu Jiangsu Key Laboratory of Biofunctional Materials Jiangsu Key Laboratory of New Power BatteriesSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210046China

All-inorganic lead halide perovskite CsPbX3(X=Cl,Br,and I)nanocrystals(NCs)have shown great application prospects in optoelectronic fields.Their properties can be feasibly tuned by the ratio of different halide ions.Post-synthesis halide anion exchange of Cl‒Br or Br‒I in CsPbX3 NCs allows getting any desired composition of CsPbClxBr3−x and CsPbBr_(x)I_(3−x)(0≤x≤3).However,due to the large difference of the Cl and I radii,they can only substitute each other in a limited ratio to form CsPbCl_(y)I_(3−y)(0

关键词： all-inorganic perovskite nanocrystals anion exchange ternary phase diagram

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Roles of effective stabilizers in improving oral bioavailability of naringenin nanocrystals:Maintenance of supersaturation generated upon dissolution by inhibition of drug dimerization

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Asian Journal of Pharmaceutical Sciences 2022年第5期17卷 741-750页

作者： Guangshuai Zhang Haishan Guan Jianfeng Li Mo Li Xiaofan Sui Baocheng Tian Huiming Dong Bingyang Liu Zhonggui He Ning Li Mingming Zhao Qiang Fu Wuya College of Innovation Shenyang Pharmaceutical UniversityShenyang 110016China Department of Pharmacy Shengjing Hospital of China Medical UniversityShenyang 110004China School of Pharmacy Shenyang Pharmaceutical UniversityShenyang 110016China Liaoning Institute for Drug Control Shenyang 110016China School of Pharmacy Binzhou Medical UniversityYantai 264003China Liaoning Inspection Examination and Certification Centre Shenyang 110016China

nanocrystals(NCs),a colloidal dispersion system formulated with stabilizers,have attracted widespread interest due to their ability to effectively improve the oral bioavailability of poorly water-soluble drugs.The stabilizer plays a key role because it can affect the physical stability and even the oral bioavailability of NCs.However,how stabilizers affect the bioavailability of NCs remains unknown.In this study,F68,F127,HPMC,and PVP were each used as a stabilizer to formulate naringenin NCs.The NCs formulated with PVP exhibited excellent release behaviors,cellular uptake,permeability,oral bioavailability,and anti-inflammatory effects.The underlying mechanism is that PVP effectively inhibits the formation of naringenin dimer,which in turn improves the physical stability of the supersaturated solution generated when NC is dissolved.This finding provides insights into the effects of stabilizers on the in vivo performances of NCs and supplies valuable knowledge for the development of poorly water-soluble drugs.

关键词： nanocrystals Stabilizers Bioavailability Supersaturation maintenance Dimer

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Effects of chitin nanocrystals on coverage of coating layers and water retention of coating color

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Journal of Bioresources and Bioproducts 2022年第3期7卷 201-210页

作者： Ruoshi Gao Yi Jing Yeyan Ni Qiwen Jiang Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Light Industry and Food EngineeringNanjing Forestry UniversityNanjing 210037China

This study assessed the applicability of chitin nanocrystals prepared by 2,2,6,6-Tetramethyl-1-Piperidine-1-oxyl radical(TEMPO)-mediated oxidation in traditional papermaking coating color systems.The𝛼-chitin nanocrystals(CTNCs)with different carboxyl content,size,and morphology were prepared from crab shells by alkali pretreatment and TEMPO-mediated oxidation in the water at pH 10,and then the ratio of CTNCs to latex was applied to traditional coating color system to replace part of latex.The results showed that when the amount of NaClO added as co-oxidant in the oxidation was 15.0 mmol/g of chitin,the carboxyl content of alkali-pretreated CTNCs was up to 0.76 mmol/g.The amount of carboxyl groups presented a linear relation with the degree of individualization of nanocrystals and dispersion.When the ratio of latex to CTNCs was 90꞉10,the water retention value of the coating was 92%lower than that of the pure latex system,and the rheological property was better.The relationship between the addition amount of CTNCs and the surface strength and the coverage of coating layers were also studied,and results showed that when the ratio of latex to CTNCs was 95꞉5,the surface strength was the highest of 1.45 m/s,and the coverage of coating layers rate reached the highest of 78%.

关键词： Chitin TEMPO oxidation nanocrystals Coating coverage Water retention

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Metal phenolic network-stabilized nanocrystals of andrographolide to alleviate macrophage-mediated inflammation in-vitro

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Chinese Chemical Letters 2023年第1期34卷 225-229页

作者： Kosheli Thapa Magar George Frimpong Boafo Makhloufi Zoulikha Xiaohong Jiang Xiaotong Li Qingqing Xiao Xuyang Xing Xiaochun Wang Lifang Fan Zhenfeng Wu Wei He School of Pharmacy China Pharmaceutical UniversityNanjing 211198China Jiangsu Aosaikang Pharmaceutical Co. Ltd.Nanjing 211112China Key Laboratory of Modern Preparation of TCM Ministry of EducationJiangxi University of Chinese MedicineNanchang 330004China

Macrophages play a crucial role in initiating,maintaining,and resolving inflammation through the phenotypic shift,inducing or inhibiting the production of inflammatory cytokines.Therefore,macrophages are potential targets for treating inflammatory diseases.Andrographolide(AND)is a potent anti-inflammatory drug that can reduce pro-inflammatory cytokines and suppress NF-κB/MAPK pathway in activated macrophages.Although AND has many medicinal properties,its lower water solubility and first-pass effect in the liver have hindered its clinical application.In this context,by using a metal phenolic network as a stabilizer,we designed and prepared highly stabilized AND nanocrystals(AND-MPN Ns)with high drug loading capacity to facilitate the clinical application of AND.Our findings showed that AND-MPN Ns could be used to enhance the anti-inflammation in-vitro via macrophage polarization,reducing proinflammatory cytokines IL-6 and TNF-α,and suppressing the NF-κB signaling pathway activation.The results demonstrated the potential of AND-MPN Ns to combat inflammatory diseases effectively.

关键词： Inflammation Macrophages Andrographolide Metal phenolic network nanocrystals

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Green and controllable fabrication of nanocrystals from ionic liquids

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Chinese Chemical Letters 2022年第8期33卷 4079-4083页

作者： Weizi Huang Zhezheng Fang Xianzi Zheng Jianping Qi Wei Wu Yi Lu Key Laboratory of Smart Drug Delivery of MOE School of PharmacyFudan UniversityShanghai 201203China Center for Medical Research and Innovation Shanghai Pudong HospitalFudan University Pudong Medical CenterShanghai 201399China

nanocrystals are of great value in delivering poorly soluble drugs as a technique enables enhanced dissolution and bioavailability.The bottom-up technique allows better control of particle properties.However,the commonly used organic solvents are hazardous to environment and operators,and always lead to large particle size and wide size distribution due to failure on controlling the nucleation and crystal growth.The situation is exacerbated in scale-up production.Therefore,in the proof-of-concept study,we evaluated the feasibility of green and controllable fabrication of drug nanocrystals by using biocompatible ionic liquids(ILs)as solvents.Choline based ILs(Ch-ILs)were synthesized via metathesis reactions.Pure paclitaxel nanocrystals of high quality were obtained from Ch-ILs with surface tension higher than 42 m N/m.The sizes were below 250 nm,while the polydispersity indexes were lower than 0.25.Compared with ethanol,choline lactate is superior in controlling the size of the nanocrystals in scale-up production,where the drug concentration was increased by 6 times.The underlying mechanism may be due to the high viscosity and low surface tension of the ILs,which are supposed to benefit homogeneous and burst nucleation.Ch-ILs can be recycled from the process and recovery rate reached 91.1%.Moreover,the applicability of the green technique was validated in a wider range of model drugs and Ch-ILs.In conclusion,ILs are potent solvents in bottom-up technique for green and controllable fabrication of nanocrystals.

关键词： nanocrystals Ionic liquids Bottom-up Choline Organic acids Particle size

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